Widget Picker

[farmaazon]

To be done after both of the following issues have been closed:

• Code Input Widget #8753
• Edit numeric input on click #8751

When Numeric Input (and Code Input if ready) is in edit mode the widget picker icon should be displayed on the left of it. The displayed icon represents the current widget: # sign for Numeric Input and Enso logo for Code Input.

Clicking on icon shows drop-down allowing changing the widget type. It should show all widgets suitable to the argument type (the Code Input should be always available) - probably all widgets matching the input structure containing argument info and no AST.

We want to allow any widget to decide when display the picker.

[farmaazon]

Refinement notes:

• The Code Input should always show the picker.